I used the Metalform 7 round magazine, with the round follower and welded baseplate. It is an excellent magazine and I used it because I'd had spotty results with 8 round magazines.
My Chief gave me a couple of 8 round Chip McCormick Power Mags. They have consistently given perfect function in maybe six 1911's, throughout a wide range of ammo including light SWC reloads. I've got a half dozen of them now don't expect to need any more 1911 magazines.
“Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals. It can only be ensured by instinct, sharpened by thought practicing the stroke so often that at the crisis it is as natural as a reflex.” ~ T. E. Lawrence